/******************************************************************************
 * FileName:    gwin_miot_security.c
 * Desc:        安全
 *              米家照明开关加密算法
 *                  加密方式：MD5
 *                  加密规则：模组MAC前5个字节异或模组MAC最后一个字节,最后一个字节保持。生成待加密字段，再对生成字段进行加密；
 *
 *
 * Author:      Lin
 * Notes:
 *
 ******************************************************************************/

/*-------------------------- Includes ---------------------------------------*/
#include "gwin_miot_security.h"
#include "gwin_misc_api.h"


/*-------------------------- Macro Definitions ------------------------------*/
#define MD5_CAL_F(x, y, z)                      ((x & y) | (~x & z))
#define MD5_CAL_G(x, y, z)                      ((x & z) | (y & ~z))
#define MD5_CAL_H(x, y, z)                      (x ^ y ^ z)
#define MD5_CAL_I(x, y, z)                      (y ^ (x | ~z))
#define MD5_CAL_ROTATE_LEFT(x, n)               ((x << n) | (x >> (32 - n)))
#define MD5_CAL_FF(a, b, c, d, x, s, ac)        \
                                                {                                       \
                                                    a += MD5_CAL_F(b, c, d) + x + ac;   \
                                                    a = MD5_CAL_ROTATE_LEFT(a, s);      \
                                                    a += b;                             \
                                                }
#define MD5_CAL_GG(a, b, c, d, x, s, ac)        \
                                                {                                       \
                                                    a += MD5_CAL_G(b, c, d) + x + ac;   \
                                                    a = MD5_CAL_ROTATE_LEFT(a, s);      \
                                                    a += b;                             \
                                                }
#define MD5_CAL_HH(a, b, c, d, x, s, ac)        \
                                                {                                       \
                                                    a += MD5_CAL_H(b, c, d) + x + ac;   \
                                                    a = MD5_CAL_ROTATE_LEFT(a, s);      \
                                                    a += b;                             \
                                                }
#define MD5_CAL_II(a, b, c, d, x, s, ac)        \
                                                {                                       \
                                                    a += MD5_CAL_I(b, c, d) + x + ac;   \
                                                    a = MD5_CAL_ROTATE_LEFT(a, s);      \
                                                    a += b;                             \
                                                }


/*-------------------------- Type Declarations ------------------------------*/
typedef struct {
    uint32_t count[2];
    uint32_t state[4];
    uint8_t buffer[64];
}gwin_md5_ctrl_t;


/*-------------------------- Global Variables -------------------------------*/

/*-------------------------- Local Variables --------------------------------*/
/**
 * @brief 缓存
 */
static uint8_t PADDING[] =
{
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};


/*-------------------------- Functions Declarations -------------------------*/

/*-------------------------- Functions Definitions --------------------------*/
/**
 * @brief 初始化
 */
void gwin_md5_init(gwin_md5_ctrl_t *context)
{
    context->count[0] = 0;
    context->count[1] = 0;
    context->state[0] = 0x67452301;
    context->state[1] = 0xEFCDAB89;
    context->state[2] = 0x98BADCFE;
    context->state[3] = 0x10325476;
}

/**
 * @brief 编码
 */
void gwin_md5_encode(uint8_t *output, uint32_t *input, uint32_t len)
{
    uint32_t i = 0, j = 0;
    while (j < len)
    {
        output[j] = input[i] & 0xFF;
        output[j + 1] = (input[i] >> 8) & 0xFF;
        output[j + 2] = (input[i] >> 16) & 0xFF;
        output[j + 3] = (input[i] >> 24) & 0xFF;
        i++;
        j += 4;
    }
}

/**
 * @brief 解码
 */
void gwin_md5_decode(uint32_t *output, uint8_t *input, uint32_t len)
{
    uint32_t i = 0, j = 0;
    while (j < len)
    {
        output[i] = (input[j]) | (input[j + 1] << 8) | (input[j + 2] << 16) | (input[j + 3] << 24);
        i++;
        j += 4;
    }
}

/**
 * @brief 转换
 */
void gwin_md5_transform(uint32_t state[4], uint8_t block[64])
{
    uint32_t a = state[0];
    uint32_t b = state[1];
    uint32_t c = state[2];
    uint32_t d = state[3];
    uint32_t x[64];
    gwin_md5_decode(x, block, 64);
    MD5_CAL_FF(a, b, c, d, x[0], 7, 0xd76aa478);    // 1
    MD5_CAL_FF(d, a, b, c, x[1], 12, 0xe8c7b756);   // 2
    MD5_CAL_FF(c, d, a, b, x[2], 17, 0x242070db);   // 3
    MD5_CAL_FF(b, c, d, a, x[3], 22, 0xc1bdceee);   // 4
    MD5_CAL_FF(a, b, c, d, x[4], 7, 0xf57c0faf);    // 5
    MD5_CAL_FF(d, a, b, c, x[5], 12, 0x4787c62a);   // 6
    MD5_CAL_FF(c, d, a, b, x[6], 17, 0xa8304613);   // 7
    MD5_CAL_FF(b, c, d, a, x[7], 22, 0xfd469501);   // 8
    MD5_CAL_FF(a, b, c, d, x[8], 7, 0x698098d8);    // 9
    MD5_CAL_FF(d, a, b, c, x[9], 12, 0x8b44f7af);   // 10
    MD5_CAL_FF(c, d, a, b, x[10], 17, 0xffff5bb1);  // 11
    MD5_CAL_FF(b, c, d, a, x[11], 22, 0x895cd7be);  // 12
    MD5_CAL_FF(a, b, c, d, x[12], 7, 0x6b901122);   // 13
    MD5_CAL_FF(d, a, b, c, x[13], 12, 0xfd987193);  // 14
    MD5_CAL_FF(c, d, a, b, x[14], 17, 0xa679438e);  // 15
    MD5_CAL_FF(b, c, d, a, x[15], 22, 0x49b40821);  // 16

    MD5_CAL_GG(a, b, c, d, x[1], 5, 0xf61e2562);    // 17
    MD5_CAL_GG(d, a, b, c, x[6], 9, 0xc040b340);    // 18
    MD5_CAL_GG(c, d, a, b, x[11], 14, 0x265e5a51);  // 19
    MD5_CAL_GG(b, c, d, a, x[0], 20, 0xe9b6c7aa);   // 20
    MD5_CAL_GG(a, b, c, d, x[5], 5, 0xd62f105d);    // 21
    MD5_CAL_GG(d, a, b, c, x[10], 9, 0x2441453);    // 22
    MD5_CAL_GG(c, d, a, b, x[15], 14, 0xd8a1e681);  // 23
    MD5_CAL_GG(b, c, d, a, x[4], 20, 0xe7d3fbc8);   // 24
    MD5_CAL_GG(a, b, c, d, x[9], 5, 0x21e1cde6);    // 25
    MD5_CAL_GG(d, a, b, c, x[14], 9, 0xc33707d6);   // 26
    MD5_CAL_GG(c, d, a, b, x[3], 14, 0xf4d50d87);   // 27
    MD5_CAL_GG(b, c, d, a, x[8], 20, 0x455a14ed);   // 28
    MD5_CAL_GG(a, b, c, d, x[13], 5, 0xa9e3e905);   // 29
    MD5_CAL_GG(d, a, b, c, x[2], 9, 0xfcefa3f8);    // 30
    MD5_CAL_GG(c, d, a, b, x[7], 14, 0x676f02d9);   // 31
    MD5_CAL_GG(b, c, d, a, x[12], 20, 0x8d2a4c8a);  // 32

    MD5_CAL_HH(a, b, c, d, x[5], 4, 0xfffa3942);    // 33
    MD5_CAL_HH(d, a, b, c, x[8], 11, 0x8771f681);   // 34
    MD5_CAL_HH(c, d, a, b, x[11], 16, 0x6d9d6122);  // 35
    MD5_CAL_HH(b, c, d, a, x[14], 23, 0xfde5380c);  // 36
    MD5_CAL_HH(a, b, c, d, x[1], 4, 0xa4beea44);    // 37
    MD5_CAL_HH(d, a, b, c, x[4], 11, 0x4bdecfa9);   // 38
    MD5_CAL_HH(c, d, a, b, x[7], 16, 0xf6bb4b60);   // 39
    MD5_CAL_HH(b, c, d, a, x[10], 23, 0xbebfbc70);  // 40
    MD5_CAL_HH(a, b, c, d, x[13], 4, 0x289b7ec6);   // 41
    MD5_CAL_HH(d, a, b, c, x[0], 11, 0xeaa127fa);   // 42
    MD5_CAL_HH(c, d, a, b, x[3], 16, 0xd4ef3085);   // 43
    MD5_CAL_HH(b, c, d, a, x[6], 23, 0x4881d05);    // 44
    MD5_CAL_HH(a, b, c, d, x[9], 4, 0xd9d4d039);    // 45
    MD5_CAL_HH(d, a, b, c, x[12], 11, 0xe6db99e5);  // 46
    MD5_CAL_HH(c, d, a, b, x[15], 16, 0x1fa27cf8);  // 47
    MD5_CAL_HH(b, c, d, a, x[2], 23, 0xc4ac5665);   // 48

    MD5_CAL_II(a, b, c, d, x[0], 6, 0xf4292244);    // 49
    MD5_CAL_II(d, a, b, c, x[7], 10, 0x432aff97);   // 50
    MD5_CAL_II(c, d, a, b, x[14], 15, 0xab9423a7);  // 51
    MD5_CAL_II(b, c, d, a, x[5], 21, 0xfc93a039);   // 52
    MD5_CAL_II(a, b, c, d, x[12], 6, 0x655b59c3);   // 53
    MD5_CAL_II(d, a, b, c, x[3], 10, 0x8f0ccc92);   // 54
    MD5_CAL_II(c, d, a, b, x[10], 15, 0xffeff47d);  // 55
    MD5_CAL_II(b, c, d, a, x[1], 21, 0x85845dd1);   // 56
    MD5_CAL_II(a, b, c, d, x[8], 6, 0x6fa87e4f);    // 57
    MD5_CAL_II(d, a, b, c, x[15], 10, 0xfe2ce6e0);  // 58
    MD5_CAL_II(c, d, a, b, x[6], 15, 0xa3014314);   // 59
    MD5_CAL_II(b, c, d, a, x[13], 21, 0x4e0811a1);  // 60
    MD5_CAL_II(a, b, c, d, x[4], 6, 0xf7537e82);    // 61
    MD5_CAL_II(d, a, b, c, x[11], 10, 0xbd3af235);  // 62
    MD5_CAL_II(c, d, a, b, x[2], 15, 0x2ad7d2bb);   // 63
    MD5_CAL_II(b, c, d, a, x[9], 21, 0xeb86d391);   // 64

    state[0] += a;
    state[1] += b;
    state[2] += c;
    state[3] += d;
}

/**
 * @brief 更新
 */
void gwin_md5_update(gwin_md5_ctrl_t *context, uint8_t *input, uint32_t inputlen)
{
    uint32_t i = 0, index = 0, partlen = 0;
    index = (context->count[0] >> 3) & 0x3F;
    partlen = 64 - index;
    context->count[0] += inputlen << 3;
    if (context->count[0] < (inputlen << 3))
    {
        context->count[1]++;
    }
    context->count[1] += inputlen >> 29;
    if (inputlen >= partlen)
    {
        memcpy(&context->buffer[index], input, partlen);
        gwin_md5_transform(context->state, context->buffer);
        for (i = partlen; i + 64 <= inputlen; i += 64)
        {
            gwin_md5_transform(context->state, &input[i]);
        }
        index = 0;
    }
    else
    {
        i = 0;
    }
    memcpy(&context->buffer[index], &input[i], inputlen - i);
}

/**
 * @brief 计算结果
 */
void gwin_md5_final(gwin_md5_ctrl_t *context, uint8_t digest[16])
{
    uint32_t index = 0, padlen = 0;
    uint8_t bits[8];
    index = (context->count[0] >> 3) & 0x3F;
    padlen = (index < 56) ? (56 - index) : (120 - index);
    gwin_md5_encode(bits, context->count, 8);
    gwin_md5_update(context, PADDING, padlen);
    gwin_md5_update(context, bits, 8);
    gwin_md5_encode(digest, context->state, 16);
}


/**
 * @brief 获取秘钥
 */
void gwin_miot_security_decrypted_data(const uint8_t *mac_addr, uint32_t *miot_security_0, uint32_t *miot_security_1)
{
    gwin_md5_ctrl_t md5 = { 0x00 };
    uint8_t encrypt[16] = { 0x00 };
    uint8_t decrypt[16] = { 0x00 };
    uint8_t _mac_addr[6] = { 0x00 };

    // 地址前后对调
    for (uint8_t i = 0; i < 6; i++)
    {
        _mac_addr[i] = mac_addr[6 - 1 - i];
    }

    // 模组MAC前5个字节异或模组MAC最后一个字节,最后一个字节保持
    for (uint8_t i = 0; i < 5; i++)
    {
        _mac_addr[i] = _mac_addr[i] ^ _mac_addr[5];
    }
    sprintf((char *)encrypt, "%02X%02X%02X%02X%02X%02X", _mac_addr[0], _mac_addr[1], _mac_addr[2], _mac_addr[3], _mac_addr[4], _mac_addr[5]);

    // MD5运算
    gwin_md5_init(&md5);
    gwin_md5_update(&md5, encrypt, strlen((char *)encrypt));
    gwin_md5_final(&md5, decrypt);

    memcpy(miot_security_0, &decrypt[4], 4);
    memcpy(miot_security_1, &decrypt[8], 4);
    *miot_security_0 = HL_SWAP_U32(*miot_security_0);
    *miot_security_1 = HL_SWAP_U32(*miot_security_1);
}






/**
 * @brief 获取秘钥 只有1个属性点
 */
void gwin_miot_security_decrypted_data_1(const uint8_t *mac_addr, uint32_t *miot_security_0)
{
    uint8_t sum = 0;
    sum = mac_addr[0] + mac_addr[1] + mac_addr[3]  + mac_addr[4] + mac_addr[5];

    uint8_t encryption_list[4] = {0x00};
    encryption_list[0] = rand();
    encryption_list[1] = rand();
    encryption_list[2] = sum;
    encryption_list[3] = rand();

    uint32_t encryption_value = 0;
    encryption_value = (encryption_list[0] << 24) | (encryption_list[1] << 16) | (encryption_list[2] << 8) | encryption_list[3];


    *miot_security_0 = encryption_value;
}


/*-------------------------- END OF FILE ------------------------------------*/

